On Fri, Jul 1, 2016 at 1:41 PM, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> wrote:
>
>
> On 07/01/2016 10:53 AM, js1304@xxxxxxxxx wrote:
>> From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
>>
>> If we move an item on qlist's tail, we need to update qlist's tail
>> properly. curr->next can be NULL since it is singly linked list
>> so it is invalid for tail. curr is scheduled to be moved so
>> using prev would be correct.
>
> Hmm.. prev may be the element that moved in 'to' list. We need to assign the last element
> from which is in ther 'from' list.
something like this should handle qlink == head == tail:
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -251,11 +251,11 @@ static void qlist_move_cache(struct qlist_head *from,
if (obj_cache == cache) {
if (unlikely(from->head == qlink)) {
from->head = curr->next;
- prev = curr;
+ prev = from->head;
} else
prev->next = curr->next;
if (unlikely(from->tail == qlink))
- from->tail = curr->next;
+ from->tail = prev;
from->bytes -= cache->size;
qlist_put(to, qlink, cache->size);
} else {
>>
>> Unfortunately, I got this bug sometime ago and lose oops message.
>> But, the bug looks trivial and no need to attach oops.
>>
>> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
>> ---
>> mm/kasan/quarantine.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
>> index 4973505..9a132fd 100644
>> --- a/mm/kasan/quarantine.c
>> +++ b/mm/kasan/quarantine.c
>> @@ -255,7 +255,7 @@ static void qlist_move_cache(struct qlist_head *from,
>> } else
>> prev->next = curr->next;
>> if (unlikely(from->tail == qlink))
>> - from->tail = curr->next;
>> + from->tail = prev;
>> from->bytes -= cache->size;
>> qlist_put(to, qlink, cache->size);
>> } else {
>>
>
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